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<html lang="zh-cn">
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 <meta charset="utf-8"/>
 <title>我的联系方式</title>
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 width: 960px;
 margin-left: auto;
 margin-right: auto;
 border-width: 1px;
 border-style:unset ;
 border-color: gray;
 border-radius: 5px;
 text-align:center;
 background-color: beige;
}
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<a href="mailto:13579280206@139.com?subject=Hello%20again">发送Email</a>
<a href="./index.html">返回主页面</a>
</body>
</html>